public void Attach_DoesNotThrow()
{
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
Assert.DoesNotThrow(() => messageBoard.Attach(observerMock.Object));
}
public void Attach_NullObserver_ArgumentNullException()
{
var messageBoard = new MessageBoard();
var ex = Assert.Throws <ArgumentNullException>(() => messageBoard.Attach(null));
Assert.That(ex.ParamName, Is.EqualTo(AttachObserverParam));
}
public void AddMessage_ObserversNotified()
{
const string message = "Room for rent.";
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
messageBoard.Attach(observerMock.Object);
messageBoard.AddMessage(message);
observerMock.Verify(
o => o.Update(It.Is <IEnumerable <string> >(e => e.Single() == message)), Times.Once);
}
public void RemoveMessage_Nonexistent_ObserversNotNotified()
{
const string message = "Have you seen this man?";
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
messageBoard.Attach(observerMock.Object);
messageBoard.RemoveMessage(message);
observerMock.Verify(
o => o.Update(It.IsAny <IEnumerable <string> >()), Times.Never);
}
public void AddMessage_Duplicate_ObserversNotNotified()
{
const string message = "Looking for car share.";
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
messageBoard.AddMessage(message);
messageBoard.Attach(observerMock.Object);
messageBoard.AddMessage(message);
observerMock.Verify(
o => o.Update(It.IsAny <IEnumerable <string> >()), Times.Never);
}
public void RemoveMessage_ObserversNotified()
{
const string message1 = "Cat for sale.";
const string message2 = "Dog for sale.";
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
messageBoard.AddMessage(message1);
messageBoard.AddMessage(message2);
messageBoard.Attach(observerMock.Object);
messageBoard.RemoveMessage(message1);
observerMock.Verify(
o => o.Update(It.Is <IEnumerable <string> >(e => e.Single() == message2)), Times.Once);
}